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TPM_E_BUFFER_LENGTH_MISMATCH
TPM_E_BUFFER_LENGTH_MISMATCH means related input buffers have inconsistent lengths. It is usually a caller-side packing or serialization error.
What to check for TPM_E_BUFFER_LENGTH_MISMATCH
- Verify every length field against the actual byte count of its corresponding buffer.
- Check structure packing, Unicode/ANSI conversion, and any serialization boundary between managed and native code.
- Do not send partially initialized structures to the provider; validate them before the CNG call.
Microsoft: CNG key storage providers
Microsoft: TPM and PCP error codes
Diagnostic interpretation
This result has the HRESULT value 0x8029041E. AllStat records the condition as “The buffer lengths do not match.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the tpm / buffer / length / mismatch operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original tpm / buffer / length / mismatch condition.
Retry and recovery
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